Musings of One Trying to Visualize How the Ancient Romans Multiplied XVIII by LXX and got MCCLX

Thinking about the part of the First Amendment to the Constitution regarding freedom of speech, upon reflection it seems to me that the right is not absolute. As a Supreme Court justice once observed, it does not give one the right to shout "Fire!" in a crowded theater when there is no fire. Nor does it give one the right to indulge in slander or libel without penalty. Similarly, it seems to me, that the right is limited to areas owned or controlled by governmental bodies. For example, if one in charge of private property chooses to post a sign "No Profanity" that is his right; it does not restrict anyone's freedom of speech. Those who wish to engage in it are free to go out on the sidewalk and spout cuss words to their hearts' content (though they might arrested for disturbing the peace).